Two types of hydraulic brake fluid exist for bicycles, and they are completely incompatible:
| Type | Brands | Chemical base |
|---|---|---|
| Mineral oil | Shimano, Magura, Tektro | Paraffin oil |
| DOT (4 or 5.1) | SRAM, Hope, Hayes, Formula | Polyethylene glycol |
Seals are made from materials specific to each fluid type:
Both are compatible and mixable. DOT 5.1 has higher boiling point (270C vs 230C dry). You can use 5.1 in a system designed for 4.
WARNING: DOT 5 (silicone-based) is NOT the same as DOT 5.1 (glycol). Never use DOT 5.
For the complete step-by-step bleeding procedure, check our Shimano brake bleeding guide.
Not sure which fluid your brakes need? Ask L'Atelier — it knows every Shimano and SRAM reference.
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